As an instance of the rv_continuous class, lognorm object inherits from it
a collection of generic methods (see below for the full list),
and completes them with details specific for this particular distribution.

The probability density above is defined in the “standardized” form. To shift
and/or scale the distribution use the loc and scale parameters.
Specifically, lognorm.pdf(x,s,loc,scale) is identically
equivalent to lognorm.pdf(y,s)/scale with
y=(x-loc)/scale.

A common parametrization for a lognormal random variable Y is in
terms of the mean, mu, and standard deviation, sigma, of the
unique normally distributed random variable X such that exp(X) = Y.
This parametrization corresponds to setting s=sigma and scale=exp(mu).